CN111537936A - High-frequency partial discharge signal reconstruction method and system - Google Patents
High-frequency partial discharge signal reconstruction method and system Download PDFInfo
- Publication number
- CN111537936A CN111537936A CN202010529089.6A CN202010529089A CN111537936A CN 111537936 A CN111537936 A CN 111537936A CN 202010529089 A CN202010529089 A CN 202010529089A CN 111537936 A CN111537936 A CN 111537936A
- Authority
- CN
- China
- Prior art keywords
- frequency
- partial discharge
- current
- signal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000003985 ceramic capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
The application discloses a high-frequency partial discharge signal reconstruction method and system. The method comprises the steps of generating a voltage waveform U by a programmable pulse sequence generator1Is emitted by high-frequency coupling to generate a current I1(ii) a The high-frequency current sensor receives the current I generated by partial discharge0The partial discharge current I is transmitted through the self transmission impedance0Converting to a voltage waveform U storable by an oscilloscope0(ii) a Voltage waveform U output by programmable pulse sequence generator1And a partial discharge current I0Same, current I1And current I0The waveforms are the same, so that the waveform reconstruction of the high-frequency pulse current is realized. By the high-frequency partial discharge signal reconstruction method and system, typical partial discharge signals under real scene of a transformer substation site can be completely reproduced.
Description
Technical Field
The application relates to the field of electrical equipment partial discharge information processing, in particular to a high-frequency partial discharge signal reconstruction method and system.
Background
Partial discharge detection is the most important technical means in the current operation state detection technology of the electrical equipment, and the function verification of partial discharge detection instruments is the primary premise of network access detection of the instruments. At present, the calibration for high-frequency partial discharge detection instruments at home and abroad mainly focuses on the performance assessment of high-frequency sensors, including the indexes of transmission impedance, sensitivity, linearity and the like of the sensors, and the calibration research for the mode identification function of the high-frequency partial discharge detection instrument is not reported yet.
The mode recognition function verification of the high-frequency partial discharge detector is mainly realized through two modes: one method is to go to the on-site actual measurement of the transformer substation, but the on-site partial discharge environment is complex and variable, the actual measurement has a lot of uncertainties, and the test is time-consuming and labor-consuming. The other method is to design a typical defect model of partial discharge and generate a partial discharge signal in a pressurization mode, but the method has no stability and mainly reflects the conditions that the signal amplitude is not adjustable, the discharge continuity cannot be ensured, the discharge type is switched inconveniently and the like.
Therefore, a high-frequency-based partial discharge signal reconstruction method is needed to completely reproduce a typical partial discharge signal of a real scene of a substation site.
Disclosure of Invention
In order to achieve the above purpose, the present application provides the following technical solutions:
a high frequency partial discharge signal reconstruction method, comprising:
the programmable pulse sequence generator outputs a voltage waveform U1, and the voltage waveform U1 is transmitted out through high-frequency coupling to generate a current I1;
the high-frequency current sensor receives current I0 generated by partial discharge, and converts the partial discharge current I0 into voltage waveform U0 which can be stored by an oscilloscope through self transmission impedance;
the voltage waveform U1 output by the programmable pulse sequence generator is the same as the partial discharge current I0, and the current I1 is the same as the current I0, so that the waveform reconstruction of the high-frequency pulse current is realized.
The method for reconstructing the high-frequency partial discharge signal comprises the steps that the current generated by partial discharge of the partial discharge source is I0, the current I0 flows through the high-frequency current sensor, the high-frequency current sensor serves as a receiving device, the transmission impedance of the high-frequency current sensor is Z (j omega), and the high-frequency current sensor is converted into the voltage waveform U0 which can be stored by the oscilloscope.
The method for reconstructing the high-frequency partial discharge signal, wherein the relationship between the signal input I0 and U0 is shown as follows:
Uo(jw)＝I0(jw)Z(jw)
wherein Z (j ω) is the transmission impedance of the high-frequency current sensor.
The method for reconstructing a high-frequency partial discharge signal as described above, wherein the relationship between the signal source output signal waveforms U1 and U0 is:
U1(jw)＝U0(jw)/Z(jw)＝I0(jw)
therefore, the waveform of U1 is the same as that of the original pulse current I0, U1 outputs a current I1 through a 50-ohm resistor, and I1 is also the same as that of I0.
The present application further provides a high-frequency partial discharge signal reconstruction system, including: the device comprises a programmable pulse sequence generating device, a power divider, a high-frequency current sensor, an oscilloscope and a broadband impedance matching unit;
the calibration signal output by the programmable pulse sequence generator is connected with an RF power distributor with the characteristic impedance of 50 omega through a high-frequency coaxial feeder line, the calibration signal is divided into two paths to be output, one path of the calibration signal is connected with an oscilloscope through a high-frequency coaxial line and used for observing the output of the programmable pulse sequence generator, and the other path of the calibration signal is connected with a broadband impedance matching unit used for calibrating a high-frequency current sensor through the high-frequency coaxial line; wherein the characteristic impedances of the coaxial transmission lines are all 50 omega.
The high-frequency partial discharge signal reconstruction system is characterized in that the high-frequency coupling tool is used for mounting a calibrated high-frequency current sensor and is a transmission line structure formed by deforming an RF coaxial line with the characteristic impedance of 50 omega.
According to the high-frequency partial discharge signal reconstruction system, an interference signal loop is added in the high-frequency coupling tool to simulate the high-frequency interference signal in the environment of the transformer substation.
In the high-frequency partial discharge signal reconstruction system, the high-frequency coupling tool adopts a coaxial cavity with 50 Ω wave impedance, and the injection capacitor C0 adopts a high-frequency ceramic capacitor with 100pF +/-2%.
The high-frequency partial discharge signal reconstruction system comprises a high-frequency current sensor, a matching unit, a conical transition structure and a signal source, wherein the high-frequency current sensor is clamped in the middle of the matching unit, the size of a core wire and the size of a shell of the matching unit meet the requirement that the characteristic impedance is 50 ohms, the size of the shell is transited from an input terminal and an output terminal to the center to form the conical transition structure, the broadband matching requirement is met, the output end of the matching unit is connected to a digital oscilloscope with the input impedance being 50 ohms through an RF coaxial cable, and the voltage/.
By the high-frequency partial discharge signal reconstruction method and system, typical partial discharge signals under real scene of a transformer substation site can be completely reproduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a structural diagram of a high-frequency coupling tool provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a high frequency coupling tool;
fig. 3 is a schematic diagram of a high frequency signal reconstruction process.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment of the application provides a high-frequency partial discharge signal reconstruction system, which comprises a programmable pulse sequence generation device, a power distributor, a high-frequency current sensor, an oscilloscope and a broadband impedance matching unit, wherein the programmable pulse sequence generation device is used for generating a pulse sequence;
the calibration signal output by the programmable pulse sequence generator is connected with an RF power distributor with the characteristic impedance of 50 omega through a high-frequency coaxial feeder line, the calibration signal is divided into two paths to be output, one path of the calibration signal is connected with an oscilloscope through a high-frequency coaxial line and used for observing the output of the programmable pulse sequence generator, and the other path of the calibration signal is connected with a broadband impedance matching unit used for calibrating a high-frequency current sensor through the high-frequency coaxial line; wherein the characteristic impedances of the coaxial transmission lines are all 50 omega.
The high-frequency coupling tool is used for installing a calibrated high-frequency current sensor, is a transmission line structure formed by deforming an RF coaxial line with the characteristic impedance of 50 omega, and the structural diagram of the transmission line structure is shown in figure 1. The current sensor to be tested is clamped in the middle of the matching unit, the sizes of a core wire and a shell of the matching unit meet the characteristic impedance of 50 omega, the size of the shell is transited from an input terminal and an output terminal to the center to form a conical transition structure and meet the requirement of broadband matching, and the output end of the matching unit is connected to a digital oscilloscope with the input impedance of 50 omega through an RF coaxial cable to acquire the voltage/current waveform output by a signal source.
The high-frequency coupling tool adopts a coaxial cavity with 50 omega wave impedance, and the injection capacitor C0 selects a high-frequency ceramic capacitor with the frequency of 100pF +/-2%.
According to the field high-frequency partial discharge detection principle, the laboratory equivalent coupling device is a current loop with a 50-omega non-inductive resistance matching, and the whole current loop is required to be strictly matched in a wide frequency band range. The checking tool of the high-frequency partial discharge live detection device is of a current loop structure and is not connected with an external loop, and the influence of a high-frequency interference signal on checking under the environment of a transformer substation is considered, so that an interference signal loop needs to be added, and a schematic diagram is shown in fig. 2, wherein in fig. 2, Up is a high-frequency partial discharge signal, C0 is an injection capacitor, Us is an interference signal, Rs-50 omega is a noninductive resistor, M0 is a detected instrument, M1 is an oscilloscope and an HFCT is a high-frequency current sensor.
When the partial discharge source is in partial discharge, a steep pulse current is generated along with the discharge process, and a magnetic field is generated when the pulse current flows through the grounding downlead and is positioned on a plane vertical to the current propagation direction;
the high-frequency current sensor and the phase information sensor are connected to a ground wire of the power equipment and used for coupling energy from a magnetic field generated by a high-frequency partial discharge signal, converting the coupled energy into an electric signal through a coil and sending the electric signal to the high-frequency partial discharge electrification detecting instrument.
The embodiment of the present application further provides a high-frequency partial discharge signal reconstruction method, including:
step1, programmable pulse sequence generator output voltage waveform U1Is emitted by high-frequency coupling to generate a current I1；
Step2, the high-frequency current sensor receives the current I generated by partial discharge0The partial discharge current I is transmitted through the self transmission impedance0Converting to a voltage waveform U storable by an oscilloscope0；
Step3 voltage waveform U output by programmable pulse sequence generator1And a partial discharge current I0Same, current I1And current I0The waveforms are the same, so that the waveform reconstruction of the high-frequency pulse current is realized.
In particular toIn the schematic diagram of the high frequency signal reconstruction process shown in fig. 3, the current generated by the partial discharge of the partial discharge source is I0Current I of0Flowing through the high-frequency current sensor as a receiving device with transmission impedance Z (j omega), and converting into voltage waveform U which can be stored in an oscilloscope0；
Wherein the signal is input into0And U0The relationship of (A) is shown in formula 1,
Uo(jw)＝I0(jw)Z(jw) (1)
the voltage waveform output by the programmable pulse sequence generator is U1Then the current generated by high frequency coupling is I1(ii) a Wherein, the signal source outputs a signal waveform U1And U0In a relationship of
U1(jw)＝U0(jw)/Z(jw)＝I0(jw) (2)
Namely U1With the original pulse current I0Same waveform, U1Output current I through 50 omega resistor1，I1Is also related to0The waveform is the same, thereby realizing the waveform reconstruction of the high-frequency pulse current.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A method for reconstructing a high frequency partial discharge signal, comprising:
programmable pulse sequence generator output voltage waveform U1Is emitted by high-frequency coupling to generate a current I1；
The high-frequency current sensor receives the current I generated by partial discharge0The partial discharge current I is transmitted through the self transmission impedance0Converting to a voltage waveform U storable by an oscilloscope0；
Voltage waveform U output by programmable pulse sequence generator1And a partial discharge current I0Same, current I1And current I0The waveforms are the same, so that the waveform reconstruction of the high-frequency pulse current is realized.
2. The high-frequency partial discharge signal reconstruction method according to claim 1, wherein a current generated by partial discharge of the partial discharge source is I0Current I of0Flowing through the high-frequency current sensor as a receiving device with transmission impedance Z (j omega), and converting into voltage waveform U which can be stored in an oscilloscope0。
3. The high-frequency partial discharge signal reconstruction method according to claim 2, characterized in that the signal input I0And U0The relationship of (a) is shown as follows:
Uo(jw)＝I0(jw)Z(jw)
wherein Z (j ω) is the transmission impedance of the high-frequency current sensor.
4. The high-frequency partial discharge signal reconstruction method according to claim 3, wherein the signal source outputs a signal waveform U1And U0The relationship of (1) is:
U1(jw)＝U0(jw)/Z(jw)＝I0(jw)
thus U is1With the original pulse current I0Same waveform, U1Output current I through 50 omega resistor1，I1Is also related to0The waveforms are the same.
5. A high frequency partial discharge signal reconstruction system, comprising: the device comprises a programmable pulse sequence generating device, a power divider, a high-frequency current sensor, an oscilloscope and a broadband impedance matching unit;
the calibration signal output by the programmable pulse sequence generator is connected with an RF power distributor with the characteristic impedance of 50 omega through a high-frequency coaxial feeder line, the calibration signal is divided into two paths to be output, one path of the calibration signal is connected with an oscilloscope through a high-frequency coaxial line and used for observing the output of the programmable pulse sequence generator, and the other path of the calibration signal is connected with a broadband impedance matching unit used for calibrating a high-frequency current sensor through the high-frequency coaxial line; wherein the characteristic impedances of the coaxial transmission lines are all 50 omega.
6. The system for reconstructing high-frequency partial discharge signals according to claim 5, wherein the high-frequency coupling tool is used for mounting a calibrated high-frequency current sensor and is a transmission line structure formed by deforming an RF coaxial line with the characteristic impedance of 50 Ω.
7. The high-frequency partial discharge signal reconstruction system of claim 6, wherein an interference signal loop is added to the high-frequency coupling tool to simulate high-frequency interference signals in a substation environment.
8. The high-frequency partial discharge signal reconstruction system of claim 6, wherein the high-frequency coupling tool adopts a coaxial cavity with 50 Ω wave impedance, and the injection capacitor C0 adopts a high-frequency ceramic capacitor with 100pF ± 2%.
9. The system for reconstructing high frequency partial discharge signals according to claim 5, wherein the high frequency current sensor is clamped in the middle of the matching unit, the core wire and the outer shell of the matching unit have dimensions that satisfy a characteristic impedance of 50 Ω, the outer shell has dimensions that transition from the input and output terminals to the center to form a tapered transition structure that satisfies the requirement of wideband matching, and the output end of the matching unit is connected to a digital oscilloscope having an input impedance of 50 Ω through an RF coaxial cable to collect the voltage/current waveforms output by the signal source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010529089.6A CN111537936A (en) | 2020-06-11 | 2020-06-11 | High-frequency partial discharge signal reconstruction method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010529089.6A CN111537936A (en) | 2020-06-11 | 2020-06-11 | High-frequency partial discharge signal reconstruction method and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111537936A true CN111537936A (en) | 2020-08-14 |
Family
ID=71978291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010529089.6A Pending CN111537936A (en) | 2020-06-11 | 2020-06-11 | High-frequency partial discharge signal reconstruction method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111537936A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983401A (en) * | 2020-08-17 | 2020-11-24 | 红相股份有限公司 | Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6161077A (en) * | 1999-01-05 | 2000-12-12 | Hubbell Incorporated | Partial discharge site location system for determining the position of faults in a high voltage cable |
| AU2014268188A1 (en) * | 2010-01-12 | 2014-12-11 | The Johns Hopkins University | An ionic tissue stimulator |
| WO2015058068A1 (en) * | 2013-10-18 | 2015-04-23 | Utilx Corporation | Method and apparatus for measuring partial discharge charge value in frequency domain |
| CN205229440U (en) * | 2015-12-15 | 2016-05-11 | 国网北京市电力公司 | A detecting system for detecting partial discharge detector |
| CN106249185A (en) * | 2016-07-07 | 2016-12-21 | 国网北京市电力公司 | For demarcating the impedance matching unit of High Frequency Current Sensor, system and method |
| CN106842092A (en) * | 2016-12-12 | 2017-06-13 | 国网北京市电力公司 | Sensor Frequency Response scaling method and device in live testing apparatus for local discharge |
| CN206321749U (en) * | 2016-12-30 | 2017-07-11 | 南京谷贝电气科技有限公司 | A kind of shelf depreciation high frequency electric detection means |
| CN107462852A (en) * | 2017-06-22 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of scaling method of high frequency partial discharge examination instrument parameter |
| CN207232259U (en) * | 2017-08-21 | 2018-04-13 | 广西电网有限责任公司电力科学研究院 | A kind of detection circuit of partial discharge of transformer high frequency sensors transfer impedance |
| CN108037428A (en) * | 2018-01-05 | 2018-05-15 | 中国电力科学研究院有限公司 | Program control type integration checking system for high frequency sensors |
| CN207541141U (en) * | 2017-12-04 | 2018-06-26 | 重庆臻远电气有限公司 | High Frequency Current Sensor based on Rogowski coil principle |
-
2020
- 2020-06-11 CN CN202010529089.6A patent/CN111537936A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6161077A (en) * | 1999-01-05 | 2000-12-12 | Hubbell Incorporated | Partial discharge site location system for determining the position of faults in a high voltage cable |
| AU2014268188A1 (en) * | 2010-01-12 | 2014-12-11 | The Johns Hopkins University | An ionic tissue stimulator |
| WO2015058068A1 (en) * | 2013-10-18 | 2015-04-23 | Utilx Corporation | Method and apparatus for measuring partial discharge charge value in frequency domain |
| CN205229440U (en) * | 2015-12-15 | 2016-05-11 | 国网北京市电力公司 | A detecting system for detecting partial discharge detector |
| CN106249185A (en) * | 2016-07-07 | 2016-12-21 | 国网北京市电力公司 | For demarcating the impedance matching unit of High Frequency Current Sensor, system and method |
| CN106842092A (en) * | 2016-12-12 | 2017-06-13 | 国网北京市电力公司 | Sensor Frequency Response scaling method and device in live testing apparatus for local discharge |
| CN206321749U (en) * | 2016-12-30 | 2017-07-11 | 南京谷贝电气科技有限公司 | A kind of shelf depreciation high frequency electric detection means |
| CN107462852A (en) * | 2017-06-22 | 2017-12-12 | 广西电网有限责任公司电力科学研究院 | A kind of scaling method of high frequency partial discharge examination instrument parameter |
| CN207232259U (en) * | 2017-08-21 | 2018-04-13 | 广西电网有限责任公司电力科学研究院 | A kind of detection circuit of partial discharge of transformer high frequency sensors transfer impedance |
| CN207541141U (en) * | 2017-12-04 | 2018-06-26 | 重庆臻远电气有限公司 | High Frequency Current Sensor based on Rogowski coil principle |
| CN108037428A (en) * | 2018-01-05 | 2018-05-15 | 中国电力科学研究院有限公司 | Program control type integration checking system for high frequency sensors |
Non-Patent Citations (3)
| Title |
|---|
| HE NINGHUI: "Research on Reconstruction of UHF Partial Discharge Signals", 《2020 IEEE INTERNATIONAL CONFERENCE ON HIGH VOLTAGE ENGINEERING AND APPLICATION》 * |
| PRIMAS EMERALDI: "Design of matching impedance for ultra wideband partial discharge detection", 《2013 INTERNATIONAL CONFERENCE ON INFORMATION TECHNOLOGY AND ELECTRICAL ENGINEERING》 * |
| 李婷: "高频局部放电传感器传输特性测试方法及试验研究", 《湖南电力》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983401A (en) * | 2020-08-17 | 2020-11-24 | 红相股份有限公司 | Method and device for obtaining equivalent relation curve of discharge capacity and signal amplitude |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202661585U (en) | Insulation state test system for insulation copper tube bus-bar | |
| CN206321749U (en) | A kind of shelf depreciation high frequency electric detection means | |
| CN105223530A (en) | High frequency partial discharge detector verification system and calibration method thereof | |
| CN110988774A (en) | Calibration method and system of electromagnetic pulse electric field probe | |
| CN111426924A (en) | High-frequency partial discharge signal mode recognition function verification method and system | |
| Rodrigo et al. | High performance broadband capacitive coupler for partial discharge cable tests | |
| CN107656226B (en) | HFCT electrical parameter test device and test method based on transmission coefficient | |
| CN104931911A (en) | Calibration device and method of ultra-high frequency partial discharge sensor | |
| Heizmann et al. | On-site partial discharge measurements on premoulded cross-bonding joints of 170 kV XLPE and EPR cables | |
| Mier et al. | Design and characterization of a magnetic loop antenna for partial discharge measurements in gas insulated substations | |
| CN111537936A (en) | High-frequency partial discharge signal reconstruction method and system | |
| CN104977555A (en) | Direct injection controllable pulse source partial discharge meter test system and test method thereof | |
| CN110412371A (en) | Multi-coaxial cable assembly shield effectiveness detection method based on probe method | |
| CN110275125A (en) | A kind of system and method for calibrating impact current for measuring device dynamic characteristic | |
| CN201725026U (en) | Capacitive voltage divider below-the-line square-wave response experiment device | |
| CN111487452A (en) | Ultrafast current detection device and pulse test system | |
| CN109557490B (en) | Calibration device and method for fast pulse measurement probe based on pulse current source | |
| CN102053236A (en) | Square-wave generator and system and method for calibratig resistance voltage divider | |
| CN110031789A (en) | The gamut caliberating device and scaling method of high-voltage nanosecond pulse divider scale factor | |
| CN112083237B (en) | Wide-frequency characteristic time domain measurement method and system for large-scale electrical equipment | |
| Rahim et al. | Partial Discharge Detection using Developed Low-cost High Frequency Current Transformer | |
| CN114280411A (en) | Test method for obtaining high-frequency response of cable | |
| Siddiqui et al. | Novel sensor solutions for on-line PD monitoring | |
| Tikhomirov et al. | A standard system for producing very-short electromagnetic pulses with a rise time of 20 psec | |
| CN207232365U (en) | A kind of inspection circuit of partial discharge of transformer high frequency measuring instrument detection frequency band |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200814 |
|
| RJ01 | Rejection of invention patent application after publication |